Process for the production of iron sleepers



c. WALLMANN Er AL Nov. 24,5. 1936.

lPRocEss, Fok THE PRODUCT-10N oF IRON sLEEPERs v lnvento'rs:

C. Wal/mann J @ross wescbeda B. Kruse.

. [Ill IIJ Patented Nov. 24, 1936 PATENT .osaluCE PROCESS FOR THE PRODUCTION OF IRON SLEEPERS Carl Wallmann, Julius Grossweischede, and Bernhard Kruse, Mulheim-Ruhr, Germany, assignors to the firm Vereinigte Stahlwerke Aktiengesellschaft, Dusseldorf, Germany Application August 15, 1933, Serial No. 685,250

In Germany August 24, 1932 2 Claims.

This invention relates to an improvement in or modification of the invention described and claimed in our prior patent application Serial No. 589,466 issued December 10, 1935, as Patent No. 2,023,827.

The said prior application relates to a method of producing iron sleepers having ribbed plates cr ribbe-d reinforcements for engaging the rails in which a flat iron, the thickness of which corresponds approximately to the thickness of the rib, or a rolled iron with a continuous central reinforcement, having also the thickness of the rib, are pressed in a die into the form of a sleeper, the ribs being formed in known manner by pressing down or forging the surplus material.

The object of the present invention is to improve this method by reducing the power required for the pressing process. According to the present invention, this is obtained by providing the preliminarily worked piece while still in the flat condition with ribs for engaging the rails, and then pressing it into the final troughlike shape.

Preferably the preliminary work piece is in the first pressing step at the same time widened toI a certain degree so that its width corresponds approximately to that of the developed sleeper prole.

A further feature of the present invention is that the transverse section of the sleeper in the centre, that is between the rib projections, either in its entirety or in part, may vary and width, height or thickness may have different dimensions from those of the standard sleeper. The aim and result of this is also to reduce, as much as possible, the power required for the pressing.

In order that the invention may be more clearly understood one particular form thereof will now be described with reference to the accompanying drawing wherein:

Figure 1 is a side View of a preliminary work piece,

Figure 2 is a plan view according to' Fig. 1,

Figure 3 is a cross section through line L -b of Fig. 2.

Figure 4 is a side View of a preliminary work piece after the iirst pressing,

Figure 5 is a plan view according to Fig. 4,

Figure 6 is a cross section on line a-h of Fig. 4,

Figure '7 is a cross section on line c-d of Fig. 4,

Figure 8 is a longitudinal section of a nished sleeper after the second pressing,

Figure 9 is a plan View of Fig. 8,

(Cl. Bti-169) Fig. 10 is a cross section on line at-U of Fig. 8,

Figure 1l is a cross section on line c-d of Fig. 8.

Referring to the drawing the flat preliminary work piece having a continuous longitudinal rib 5 or reinforcement I, as shown in Figures 1 to 3, is rst pressed into the shape shown in Figures 4 to 7 in which the longitudinal rib l is partially pressed down except at its middle portion and at the rail contact parts in such a manner that a ilat intermediate work piece is produced which has a longitudinal rib 4 in its middle portion and two rail engaging projections 2 at each rail contact part. During this pressing operation the work piece which remains ilat is widened to such a degree, for example 20-25%, that its Width corresponds to that of the developed shape of the iinal sleeper; the middle portion which is provided with the longitudinal rib 4 remains smaller in width than the other parts. The nal sleeper thereupon is produced by pressing the said intermediate piece into the desired trough-like sleeper shape 3, according to Figs. 8 to 11, during which operation the dimensions of the work piece are not changed so that the final sleeper is provided with a longitudinal rib Il at its middle portion between the rail contact parts and with the rail engaging projections 2 corresponding to that of the intermediate work piece of Figs. 4 to '7; further the final sleeper has likewise a lesser width in its middle portion than at the other parts.

The present invention, however, is not limited to this particular example. In particular the fundamental idea of shaping the ribs iirst, while the working piece is still in its flat condition, can be advantageously effected by means of a rolling mill. The particular shape here shown for the preliminary work piece is also not of essential importance.

What we claim and desire to secure by Letters Patent in the United States is:

1. Process for the production of iron sleepers consisting in partially pressing down the longitudinal rib of a flat preliminary work piece ex- 45 cept at its middle portion and the rail contact parts in such a manner that a ilat intermediate work piece of a width corresponding to that of the developed shape of the iinal sleeper is produced which has a longitudinal rib in its middle 50 f portion and at least two rail engaging projections at each rail contact part, the said intermediate piece having a lesser width at its middle portion than at the other parts, and then pressing the said intermediate piece without changing its 55 dimensions into the trough-like shape of the nal sleeper.

2. Process for the production of iron sleepers consisting in pressing down the longitudinal rib of a at preliminary Work piece except at the rail contact parts in such a. manner that a flat intermediate Work piece of a Width corresponding to that of the developed shape of the final sleeper is produced which has two rail engaging projections at each rail contact part and then pressing the said intermediate piece Without changing its dimensions into the troughlike shape of the final sleeper.

CARL WALLMANN.

JULIUS GROSSWEISCHEDE.

BERNHARD KRUSE. 

